When creating a new application or server, the packages are pre-organized in bundles.
In the case of a new application, the available bundles are based on the nature of the application itself.
For example, when creating a Wordpress application, the available bundles are:
LAMP (Linux, Apache, Mysql, PHP)
LAMP (Linux, Nginx, Mysql, PHP)
LAMP + Varnish + Nginx
Depending on what bundle is selected, each of the composing packages can be further customized by selecting the preferred version in the Select Package Version section.
When creating a custom application or a new server, more package bundles are available by choosing one of the Package categories.
There is also the option to not install any packages at all by selecting No Packages from Package categories.